construction
drawings, just as the mechanicalplan,
are generally superimposed on thebuilding
plan and the plot plan.

In this chapter, we will address
electrical plansas those drawings
that pertain to the ELECTRICAL(POWER)
DISTRIBUTION SYSTEM,which indicate
outside power lines and appurtenancesfor
multibuilding installations, and theINTERIOR
ELECTRICAL WIRING SYSTEM.As an
EA3, the electrical layout for both lightand
power is your main concern. You will berequired
to draw electrical drawings and layoutsfrom
notes, sketches, and specifications providedby
the designing engineer. Although you are notrequired
to design the electrical wiring system, youmust
be familiar with the methods, the symbols,and
the nomenclature, as well as the basicfunctions
of the components associated withthe
electrical systems, its transmission anddistribution,
and the circuits hookup. In addition,you
must also be familiar with the codes (bothNEC®and
local) and standards and specifications,and
be able to apply that knowledge indrawing
electrical plans.

STANDARDS AND SPECIFICATIONS
REQUIREMENTS

Because the safety of the electrical system is of
prime importance, it is imperative that all Navy
electrical
installations ashore conform to rigid standards
and specifications. When preparingconstruction
drawings, the EAs, like the CES, arerequired
to follow the specifications issued by theNaval
Facilities Engineering Command (NAV-FACENGCOM).In
particular, an EA workingon
electrical wiring and layout diagrams forelectrical
plans should refer to the latest editionof
ANSI Y32.9 and ANSI Y14.15.

offer
protection for the consumer against un-skilledelectrical
labor. Among other functions,the
NEC®serves
as a basis for limiting the typeand
wiring to be used, the circuit size, the outletspacings,
the conduit requirements, and the like.In
addition, local codes are also used whenseparate
electrical sections are applicable to thelocale
in which the building will be built. Becertain
that you always have a copy of the latestedition
of the NEC®available
for your use.

Similarly, all of the types of electrical

devices
and fixtures included in the materials listprepared
for electrical plans are to meet certainspecifications
and minimum requirements. Anindependent
organization called Underwriters

Figure 9-23.-Common types of
electrical symbols.

Laboratories (UL) tests various electrical fixtures

and
devices to determine if they meet minimumspecification
and safety requirements as set up byUL.
Those fixtures and devices that are approvedmay
then bear UL labels.